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CVE-2021-21338

4.7 · MEDIUM

TYPO3 is an open source PHP based web content management system.

Published Mar 23, 2021CWE-601EPSS 1.10%

Overview

CVE-2021-21338 is a medium-severity vulnerability. It was published on March 23, 2021 and has a CVSS 3.1 base score of 4.7 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 4.7, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

TYPO3 is an open source PHP based web content management system. In TYPO3 before versions 6.2.57, 7.6.51, 8.7.40, 9.5.25, 10.4.14, 11.1.1 it has been discovered that Login Handling is susceptible to open redirection which allows attackers redirecting to arbitrary content, and conducting phishing attacks. No authentication is required in order to exploit this vulnerability. This is fixed in versions 6.2.57, 7.6.51, 8.7.40, 9.5.25, 10.4.14, 11.1.1.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/TYPO3/TYPO3.CMS/security/advisories/GHSA-4jhw-2p6j-5wmpRefpackagist.org/packages/typo3/cms-coreReftypo3.org/security/advisory/typo3-core-sa-2021-001GitHubgithub.com/TYPO3/TYPO3.CMS/security/advisories/GHSA-4jhw-2p6j-5wmpRefpackagist.org/packages/typo3/cms-coreReftypo3.org/security/advisory/typo3-core-sa-2021-001

How CyberStrike helps

Frequently asked questions

What is CVE-2021-21338?

CVE-2021-21338 is a medium-severity vulnerability. It was published on March 23, 2021 and has a CVSS 3.1 base score of 4.7 (MEDIUM).

How severe is CVE-2021-21338?

This vulnerability has a CVSS 3.1 base score of 4.7, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2021-21338?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2021-21338?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-21338 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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